I have created a complex molded fuel tank. Our vendor who is molding this part for us would like to change the filler neck threads. They had a model of the standard neck they would like to use. I cut my filler neck off, created a new assembly, added their filler neck & saved as a merged solid shrinkwrap to make it a part again. When saving the shrinkwrap I choose to copy datum refs from the original part, thinking this would keep the view orientation in the original drawing consistant. It doesn't. My question is how can I retain the same datum refs in the drawing when creating a new part. I removed the default coordinate sys and datums from the shrinkwrap so the only planes are the copied ones from the shrinkwrap. Thanks for the replies and sorry to be so long winded.